<!DOCTYPE html>
 <head>
  <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>
  <script src="video_2.js"></script>
 </head>

 <body>
  <input type="button" id="btnMp4" value="验证MP4" /><br />
  <input type="button" id="btnOgg" value="验证Ogg" /><br />
  <input type="button" id="btnWebM" value="验证WebM" /><br />
 </body>
</html>
